Settings for Vectra GSi V6

[Elstro]

I have 2 Vectra GSi V6s in my garage, one Vauxhall, one Opel (gained trhu a launguage switch!) and I am really struggling to try and get them to handle.
I have tried changiing tyres, but that doesnt work, and the TCS just stops it cornering. My main problem is that they slide in corners. ANyone got any decent settings?